First of, the 6" (v3) is an older device. And slower due to that fact (slower processors). And I can't speak for the Opus or 360, as I don't have those, but my Mini never had problems (at least, once I flashed the original firmware to solve the battery problem...).
If I had to chose from the Opus or 360, I'd most likely pick the 360, due to the cover on it, though.
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